It seems that chrome change the way it inserts hyperlinks into richt text boxes (and with chrome pretty much all other browsers). The new way is incompatible with a security feature which prevents unknown (and therefore potentially dangerous) html code to be inserted into rich text boxes.
If you have that error you can
open the admin client
hold the shift key and browse to Server Settings → [HTML Cleanup]
Note: this setting is normally hidden that’s why you need to hold the shift key to see it
in there is a bit of code you can remove: noreferrer
Once this is is removed and saved it should work again.